package util;

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;

public class LimitadorCaracteres extends PlainDocument{

	private static final long serialVersionUID = 1L;
	private int limit;
	// optional uppercase conversion
	private boolean toUppercase = false;

	public LimitadorCaracteres(int limit) {
		super();
		this.limit = limit;
	}

	public LimitadorCaracteres(int limit, boolean upper) {
		super();
		this.limit = limit;
		toUppercase = upper;
	}

	public void insertString
	(int offset, String  str, AttributeSet attr)
	throws BadLocationException {
		if (str == null) return;

		if ((getLength() + str.length()) <= limit) {
			if (toUppercase) str = str.toUpperCase();
			super.insertString(offset, str, attr);
		}
	}


}
